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Patra, Dhananjaya,Lee, Jaehyuk,Lee, Jongbok,Sredojevic, Dusan N.,White, Andrew J. P.,Bazzi, Hassan S.,Brothers, Edward N.,Heeney, Martin,Fang, Lei,Yoon, Myung-Han,Al-Hashimi, Mohammed The Royal Society of Chemistry 2017 Journal of materials chemistry. C, Materials for o Vol.5 No.9
<P>New low band gap copolymers P1-P4, based on thienylenevinylene (TV) and pyrrolo[3,2-d:4,5-d']bisthiazole (PBTz) units composed of different alkyl side chains, such as 2-octyldodecyl (OD), n-hexadecyl (HD), 2-ethylhexyl (EH), and 9-heptadecyl (HD) groups, respectively, have been synthesized and characterized. Electrochemical and optical studies of the copolymers indicated low energy band gaps in the range of 1.40-1.47 eV. Moreover, theoretical calculation with density functional theory (DFT) and time-dependent DFT calculations demonstrated that the energy band gaps, HOMO energy levels and maximum absorption values in the copolymers were in good agreement with the experimental results. The decomposition temperature of all copolymers was measured to be above 340 degrees C by thermogravimetric analysis (TGA), which indicates high thermal stability. Thermally annealed OTFT devices based on P1-P4 thin films demonstrated a range of hole mobilities; thus, the P2 based OTFT device exhibited the highest hole mobility of 0.062 cm(2) V-1 s(-1).</P>
B. Chinnappa Reddy,H.C. Manjunatha,Y.S. Vidya,K.N. Sridhar,U. Mahaboob Pasha,L. Seenappa,B. Sadashivamurthy,N. Dhananjaya,K.V. Sathish,P.S. Damodara Gupta 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.3
In the present communication, pure and stable a-Bismuth Oxide (Bi2O3) nanoparticles (NPs) weresynthesized by low temperature solution combustion method using urea as a fuel and calcined at 500oC. The synthesized sample was characterized by using powder X-ray Diffraction (PXRD), Scanning ElectronMicroscopy (SEM), Energy dispersive X-ray analysis (EDAX), Transmission Electron Microscopy (TEM),Fourier Transform Infrared Spectroscopy (FTIR) and UVeVisible absorption spectroscopy. The PXRDpattern confirms the formation of mono-clinic, stable and low temperature phase a-Bi2O3. The directoptical energy band gap was estimated by usingWood and Tauc's relation which was found to be 2.81 eV. The characterized sample was studied for X-ray/gamma ray shielding properties in the energy range0.081e1.332 MeV using NaI (Tl) detector and multi channel analyzer (MCA). The measured shieldingparameters agrees well with the theory, whereas, slight deviation up to 20% is observed below 356 keV. This deviation is mainly due to the influence of atomic size of the target medium. Furthermore an accuratetheory is necessary to explain the interaction of X-ray/gamma ray with the NPs.The present workopens new window to use this facile, economical, efficient, low temperature method to synthesizenanomaterials for X-ray/gamma ray shielding purpose